Cylinder Inspection and Regulations Flashcards
7 cards from real CNG practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Cylinder Inspection and Regulations flashcards as text
Beyond scheduled periodic inspections, what event triggers a mandatory out-of-schedule CNG cylinder inspection per NFPA 52?
Answer: The cylinder being involved in any accident or fire event
NFPA 52 requires immediate cylinder inspection after any accident, fire, or event that may have damaged the fuel system, regardless of the scheduled inspection interval.
Which NFPA standard specifically addresses compressed natural gas vehicular fuel systems?
Answer: NFPA 52 (Vehicular Natural Gas Fuel Systems Code)
NFPA 52 is the Vehicular Natural Gas Fuel Systems Code and is the primary standard governing CNG fuel systems installed on motor vehicles.
As marked on a CNG cylinder, the term 'service pressure' refers to which of the following?
Answer: The maximum pressure the cylinder is designed for during normal fueling and operation
Service pressure is the maximum operating pressure the cylinder is rated for during normal use, typically 3,000 or 3,600 psi for CNG vehicle cylinders.
When a CNG cylinder reaches the manufacturer's specified service life limit, what is the only compliant action?
Answer: Permanently remove the cylinder from service and replace it with a new cylinder
Once the service life limit is reached, the cylinder must be replaced—no hydrostatic test, engineering assessment, or pressure reduction can legally extend its service life.
How must a condemned (rejected) CNG cylinder be rendered unusable before disposal?
Answer: Permanently disable it through methods such as drilling, crushing, or cutting the cylinder body
Condemned CNG cylinders must be permanently disabled—typically by drilling or cutting—to ensure they cannot be put back into pressurized service.
Which record must be maintained for each CNG cylinder throughout its operational service life?
Answer: A cylinder history record documenting all inspections, damage events, repairs, and service dates
NFPA 52 and industry standards require a complete cylinder history record to document inspection dates, damage events, and service life tracking.
Which US federal agency administers FMVSS 304, the Federal Motor Vehicle Safety Standard for CNG fuel containers?
Answer: NHTSA (National Highway Traffic Safety Administration)
NHTSA (National Highway Traffic Safety Administration) administers FMVSS 304, which sets performance and labeling requirements for CNG fuel containers in motor vehicles.